goldsmith



Patented Mar. 18, 1924.

MAX S. GOLDSMITH, OF CINCINNATI, OHIO.

oonoanrn r-Loon consrnuorron,

Application filed November 23, 1921. Serial No. 517,353.

T 0 all whom it may concern:

Be it known that I, MAX S. GOLDSMITH, a citizen of the United States of America, and a resident of Cincinnati, in the county of Hamilton and State of Ohio, have invented new and useful Improvements in Concrete Floor Constructions, of which thefollowing is a specification.

This inventlon relates to lmprovements n concrete floor constructlons, especially m that type wherein the ceiling is produced in a finished condition simultaneously with the moulding of the beams, cross beams and floor slabs of the structure.

An object of my invention is to produce a concrete floor construction in which the portion forming the ceiling consists of separately formed members embedded in the concrete of the beams and cross beams with one surface finished to present a finished ceiling upon removal of the supporting frame work.

Another object is to provide an eflicient locking means for securing the ceiling elements upon the concrete beams, crossl beams, etc.

These and other objects are attained by the means described herein and disclosed in the accompanying drawings, in which Fig. 1 is a plan'view of a number of ceiling plates or tiles showing. their relation when positioned to have a plastic material poured thereupon.

Fig. 2 is an enlarged sectional view on line 22 of Fig. 1.

Fig. 3 is a perspective view of a ceiling plate forming a detail of my invention, each of the portions of the tile showinga difl'erent form of groove.

In constructing a floor embodying my invention, a series of rows of ceiling plates 1 of any suitable material, are laid upon centering boards 2 forming a portion of the temporary form work 3, only the ends of the plates being supported upon the boards with the edges of the plates abutting both longitudinally and transversely. The upper face of each plate has formed in it along the side edges 15 thereof, the grooves 4 of a substantially .V-shape, wherefore when two plates 1 have their end edges 15 in engagement one with the other, a dove tailed wedge 5 is formed which extends upwardly from the temporary form work on the side of the ceiling plate opposite to that which engages said temporary form work. The

and lower with side edges that are thickerthan the central or intermediate portion of the plate and then undercutting the plate. 6 are formed upon the upper surface of the ceiling plate and extend substantially-parallel with the'grooves 1. These grooves 6.

may be formed in any suitable manner for instance by means of upwardly projecting lugs 7 and 8 extending from the ceiling plate. The grooves 6 may be disposed parallel with all four edges of the plates, as shown in the left-hand portion of Figs. 1 and 3, or they may be extended between two of the opposite sides 16 of said plates and parallel with the ends of such plates as shown in the right-hand portion of Figs. 1 and 3, whereby the grooves 6 of one plate register with similar grooves of the adjacent .plate. The grooves 6 are preferably rectan-' gular in form and have seated in them the lower edges of preferably, sheet metal,

grooves 6 serving to prevent the edges of Grooves grooves 4 are formed providing the plates arched forms or domes 9, the walls of the the domes from spreading when the concrete is placed on the forms. The domes may be made rectangular in order to seat in the grooves 6 shown in the left-hand portion of Fig. 1, whereby concrete beams will be formed in the spaces 10 between the domes in the right-hand portions of Fig. 1, and cross beams or girders be formed in the spaces 11 between the domes in the upper ortions of the left-hand portion of Fig.1. When using the structure shown in the right-hand portion of Fig. 1, there willbe no cross beams formed because the domes will be co-extensive with the groovesv then placed betweenthe domes. In pouring, the concrete is worked into the V-shaped grooves formed on opposite ends of the dove tailed keys 5, and is caused to occupy the space between the sides of the domes so as to form beams and cross beams. The pouring is continued until the concrete is filled in and covers the tops of the domes to the required depth to form the floor slabs. Thus, after the concrete has hardened and the formwork 2 and 8 has been removed, the ceiling plate will be supportedby the concrete keys 13 formed by the hardened concrete occupying the grooves 4 upon opposite sides of the plate keys 5,

and the concrete occupying the spaces between the sides of domes will form beams and cross beams of the structure, the upper surface M of the concrete forming the floor surface and the ceiling plates 1 forming the ceiling of the story next below. lVith such 2L construction it is unnecessary to finish the surface of the ceiling, especially when the face of the plates are glazed or formed With ornamental figures. If, however, it is de sired to give the ceiling a plastic finish, the plates may be of rough construction to receive the plaster.

What I claim is:

In a concrete floor construction the combination of a series of ceiling plates having; their ends and sides in abutment upon one another and having depressions in their top whereby substantial edges are formed on the plates and a relatively thin intermediate plate portion is provided, the edges being undercut and the abutting edges of adj acent plates together forming a dove-tailed key, the plates being pr yided with grooves intermediate the undercut edges for receiving the bottom edges of domes and for preeluding lateral displacement and spreading; of the domes, domes having their bottom edges seated in the grooves therefor provided, and concrete surroundingthe domes, covering the tops of the plates and extend inc between the domes and the undercut edges.

In testimony whereof, l have hereunto subscribed my name this 16th day of No vember, 1921.

MAX S. GOLDSMITH 

